213021233 has 4 divisors (see below), whose sum is σ = 215414820. Its totient is φ = 210627648.

The previous prime is 213021223. The next prime is 213021251. The reversal of 213021233 is 332120312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16096144 + 196925089 = 4012^2 + 14033^2 .

It is a cyclic number.

It is not a de Polignac number, because 213021233 - 2¹⁸ = 212759089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213021223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1196660 + ... + 1196837.

It is an arithmetic number, because the mean of its divisors is an integer number (53853705).

Almost surely, 2^213021233 is an apocalyptic number.

It is an amenable number.

213021233 is a deficient number, since it is larger than the sum of its proper divisors (2393587).

213021233 is an equidigital number, since it uses as much as digits as its factorization.

213021233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393586.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 213021233 is about 14595.2469317926. The cubic root of 213021233 is about 597.2291056805.

Adding to 213021233 its reverse (332120312), we get a palindrome (545141545).

The spelling of 213021233 in words is "two hundred thirteen million, twenty-one thousand, two hundred thirty-three".